An H i interstellar bubble surrounding WR 85 and RCW 118

  1. J. Vasquez1,*,
  2. C. Cappa1,2,*,
  3. N. M. McClure-Griffiths3

Article first published online: 8 AUG 2005

DOI: 10.1111/j.1365-2966.2005.09349.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 362, Issue 2, pages 681–688, September 2005

Additional Information

How to Cite

Vasquez, J., Cappa, C. and McClure-Griffiths, N. M. (2005), An H i interstellar bubble surrounding WR 85 and RCW 118. Monthly Notices of the Royal Astronomical Society, 362: 681–688. doi: 10.1111/j.1365-2966.2005.09349.x

Author Information

  1. 1

    Instituto Argentino de Radioastronomía, C.C.5. 1894, Villa Elisa, Argentina

  2. 2

    Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, La Plata, Argentina

  3. 3

    Australia Telescope National Facility, CSIRO, PO Box 76, Epping NSW 1710, Australia

*★ Fellow of CONICET, Argentina.
†E-mail: pete@tux.iar.unlp.edu.ar
‡Member of Carrera del Investigador, CONICET, Argentina.

Publication History

  1. Issue published online: 8 AUG 2005
  2. Article first published online: 8 AUG 2005
  3. Accepted 2005 June 23. Received 2005 June 22; in original form 2005 March 23

SEARCH

SEARCH BY CITATION

ARTICLE TOOLS

View Full Article (HTML) Get PDF (320K)

Keywords:

  • stars: Wolf–Rayet;
  • ISM: bubbles;
  • ISM: H ii regions

ABSTRACT

We analyse the distribution of the interstellar matter in the environs of the Wolf-Rayet star LSS 3982 (= WR 85, WN6+OB?) linked to the optical ring nebula RCW 118. Our study is based on neutral hydrogen 21-cm line data belonging to the Southern Galactic Plane Survey (SGPS).

The analysis of the H i data allowed the identification of a neutral hydrogen interstellar bubble related to WR 85 and the 25-arcmin-diameter ring nebula RCW 118. The H i bubble was detected at a systemic velocity of −21.5 km s−1, corresponding to a kinematical distance of 2.8 ± 1.1 kpc, compatible with the stellar distance. The neutral structure is about 25 arcmin in radius or 21 ± 8 pc, and is expanding at 9 ± 2 km s−1. The associated ionized and neutral masses amount to 3000 M⊙. The carbon monoxide (CO) emission distribution depicts a region lacking CO coincident in position and velocity with the H i structure. The 9.3-arcmin-diameter inner optical nebula appears to be related to the approaching part of the neutral atomic shell. The H i void and shell are the neutral gas counterparts of the optical bubble and have very probably originated in the action of the strong stellar wind of the central star during the O-type and WR phases on the surrounding interstellar medium. The H i bubble appears to be in the momentum conserving stage.

View Full Article (HTML) Get PDF (320K)